Question: = 3. A truck has a drag coeffi cient based on frontal area of D 0.86. The truck has a mass of 12,750 kg

= 3. A truck has a drag coeffi cient based on frontal area of D 0.86. The truck has a mass of 12,750 kg and a frontal area of 10.5 m. If the truck is traveling at constant speed on a level road, the forces retarding its forward progress are the drag and the rolling friction. The force due to rolling friction can be written as where V is the truck speed in m/s, Vo = V F = Wfr (1+V) 30 m/s and fr (the coeffi cient of rolling resistance) is approximately 0.008 for a truck on concrete or asphalt. Plot the total power the engine must supply as a function of truck speed, V. Comment on the relative importance of drag and rolling friction in the fuel consumption of the truck.

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